Propane tanks for the home can be installed either above or below ground. Propane tanks are available in a range of sizes to accommodate your needs. Common sizes for above ground tanks are 120, 250, 500, or 1,000 gallon, while underground tanks are usually either 500 or 1,000 gallons. The size of the tank needed depends on how much propane will be used, which varies by size of the home, climate, and the number of appliances powered by propane.
Auxin. Auxin. (Science: plant biology) a group of plant growth substances (often called phytohormones or plant hormones), the most common example being indole Acetic Acid (IAA), responsible for raising the ph around cells, making the cell wall less rigid and allowing elongation.he concentration of auxin has the deciding effect on how much (and where) growth occurs in a plant. Please contribute to this project, if you have more information about this term feel free to edit this page. This page was last modified on 3 October 2005, at 21:16.This page has been accessed 23,348 times.
Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance). They are produced in the stem, buds, and root tips. Example: Indole Acetic Acid (IA). Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant. This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism. Auxin also plays a role in maintaining apical dominance.